iphone - Move Background CCSprite repeatedly like a moving road -

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i'm new cocos2d , have image 640 x 1136 pixel , set background sprite statically. want move sprite, continuously moving background in upward direction. set code below in init method. here code :

background = [ccsprite spritewithfile:@"bgimagevertical.png"];     background.scalex = 1;     background.scaley = 1;     nslog(@"size x :: %f  &&  y :: %f",size.width,size.height);     background.position = ccp(size.width/2,size.height/2);     [self addchild:background];

lot of parallax scrolling tutorials available on internet. try searching right term. here 1 you: http://www.learn-cocos2d.com/2012/12/ways-scrolling-cocos2d-explained/


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